[Skyld]

The computer you are running on and the connection are two totally seperate things. If you are experiencing problems with network lag, I suggest the problem is somewhere on the network between you and the Internet itself, since plenty of people simply don't have this problem. In that case I am not sure of a remedy. With the client you could try enabling or disabling UDP. RC I am not sure.

If you are experiencing graphical lag, do the normal routine things. Update your graphics drivers, check for any tasks that are eating CPU away, etc.